99 Mercury Sable-Serpentine Belt Squeal

UNDRGRACE3

1999 MERCURY SABLE

6 CYL

2WD

AUTOMATIC

115,000 MILES

I'm having an issue with something squealing. I was told my serpentine belt was cracked, and causing the noise. I had that replaced 2 days ago. After one day of driving, the squealing started back up again, worse than before. The belt is not in an easy place to reach, and I have no idea what to check for to find out what could be causing the noise.